Measuring method for cable force of suspension bridge

A measurement method and the technology of slings, which are applied in the directions of instruments, calculations, and electrical digital data processing, etc., can solve problems such as cable forces of suspension bridges that have not been seen, and achieve the effect of improving measurement efficiency

Active Publication Date: 2017-09-19
GUANGZHOU UNIVERSITY +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the analysis of the actual suspension cable structure, there is another kind of problem: the node coordinates of the suspension cable are known, and the internal force problem of the suspension cable node is solved, which is the inverse problem of the shape-finding problem of the suspension cable-"finding force with shape "question
The inventor found that the measurement of the cable force of the suspension cable can be realized by the method of "finding the force by shape", but in the related art, there is no method for obtaining the cable force of the suspension bridge based on the problem of "finding the force by shape" of the suspension bridge structure

Method used

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  • Measuring method for cable force of suspension bridge
  • Measuring method for cable force of suspension bridge
  • Measuring method for cable force of suspension bridge

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] The cross-sectional area of ​​a single suspension cable is A=1200cm 2 , modulus of elasticity E=195GPa, self-weight of the cable is q 0 =100N / m, the horizontal tension at both ends of the cable is H 0 =12000N, the same concentrated load P=500N acts on the 11 twelfth points in the middle, the model of the single suspension cable is as figure 1 shown.

[0036] The present invention starts from the principle of mechanical balance of the micro-section of the suspension cable, obtains the analytical expression of the element stiffness matrix by solving the equilibrium differential equation of the element, and constructs an accurate catenary element that can be used for form-finding of the suspension cable. The finite element analysis method obtains a suspension cable form-finding method, and then obtains a suspension bridge suspension cable force measurement method according to the suspension cable form-finding method.

[0037] The form-finding method of the suspension ca...

Embodiment 2

[0055] Taking the Pearl River Huangpu Bridge as an example below, the present invention is used to identify the sling force of each sling, and the sling force identification steps are as follows:

[0056] (1) Use the method of measuring three-dimensional coordinates to measure the shape of the main cable

[0057] Take the plane and elevation control points ZJ13, ZJ15, ZJ16, and DC10-3 of the Huangpu Bridge provided by the Pearl River Huangpu Bridge Measurement Center as the starting point to directly measure the three-dimensional coordinates of the eighth point of the main cable. The specific measurement point layout is as follows: image 3 shown. The measuring instrument used is Leica TCA1201+ total station, with prism distance measurement accuracy: 1mm+1.5ppm, without prism distance measurement accuracy: 2mm+2ppm, angle measurement accuracy 1″.

[0058] For long-span suspension bridges, the shape of the main cable changes all the time, and it is difficult to accurately obta...

Embodiment 3

[0087] Taking the Aizhai Super-Large Bridge as an example, the sling force of each sling is identified below. In this embodiment, Matlab software is used to compile the sling force identification program of the method of the present invention to realize one-time identification of all sling forces.

[0088] (1) Measure the main cable shape

[0089] The measuring points of the main cable of Aizhai Bridge are as follows: Figure 7 As shown, the measured results of the main cable alignment are shown in Table 5, and the comparison between the measured alignment and the designed alignment is shown in Figure 8 shown.

[0090] Table 5 Measuring point coordinate test results (unit: m)

[0091]

[0092]

[0093] It can be seen from the figure that the measured value of the main cable alignment is generally in good agreement with the design curve, and the largest error occurs at the position between measuring points 6 and 7.

[0094] (2) According to the physical parameters of...

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Abstract

The invention discloses a method for measuring cable force of a suspension bridge, which comprises the following steps in sequence: Step 1, measuring the line shape of a main cable of a suspension bridge; Step 2, calculating the self-weight load concentration q0 of the main cable according to the physical parameters of the main cable; Step 3, determine the horizontal force H0 of the main cable; Step 4, build a finite element program, identify the nodal load of the lifting point, and obtain the cable force of the sling. The invention has better practicability and precision, can measure the shape of the main cable and the force of the sling at the same time, and has higher efficiency than the commonly used frequency method.

Description

technical field [0001] The invention relates to the construction field, in particular to a method for measuring cable force of a suspension bridge. Background technique [0002] The suspension cable is an important stress-bearing component of the suspension bridge. During the use of the suspension bridge, the cable force of the suspension cable is an important index to evaluate the health status of the suspension cable structure. The most commonly used method for measuring the force of slings is the frequency method, but the measurement efficiency of the frequency method is low, and other internal changes of the cable cannot be measured at the same time. [0003] In related technologies, the form-finding problem of the main cable structure of the suspension bridge is the core problem in the static analysis of the suspension bridge. There are three relatively mature methods to solve this kind of problem: finite element method, dynamic relaxation method and force density metho...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F17/50
Inventor 黄永辉王荣辉傅继阳甘泉刘爱荣饶瑞
Owner GUANGZHOU UNIVERSITY
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